only if
US /ˈoʊnli ɪf/
UK /ˈəʊnli ɪf/
連詞
只有在...才, 除非
used to state a condition that must be met for something else to happen
範例:
•
You can go to the party only if you finish your homework.
你只有在完成作業後才能去派對。
•
I will help you only if you promise to do your best.
我只有在你承諾盡力而為的情況下才會幫助你。